Data type is a date type, which is usually used to get some specific dates or convert the date format into a string. For example:

Date Date = new Date()； //Define a current date, and the output is date type.

simple date format SDF = new simple date format(" yyyy-MM-DD HH:MM:ss ")； //Create format date type

string str = SDF . format(date)； //Print format creation date. At this point, the output is a string date type.

Output result: 2015-6-3019:17: 32.